I also used this book in high school, but we used it as a practice in Grade One and Grade Two, and optimization inquiry was the most important guiding book at that time. The first round of review in the third grade is also an optimization inquiry, and there is no series of guidance programs accompanied by famous teachers. In the second round of review, we used the golden sun and felt very good. You should think it over. A good reference book will also have an impact on the college entrance examination. If you have time, I suggest.